顾名思义，通过JS和Ajax来获取上传文件的大小，在上传之前可以有个判断，对上传的文件有所控制，因为js控制文件大小（）有些问题，具体大家试下就知道了，在此整理了一下ajax的获取文件大小的方法，比较好用，再调试过程中，出现了c:/fakepath/ 的错误，也将解决方案罗列在下面，以供大家参考

 

废话少说，代码如下

JS如下：

<script language="Jscript">

function chksize(){

     

         var ticketType = "Oil";

        var file1=document.getElementById("txtfile");

        var v = file1.value;

      

file1.select();

var realpath = document.selection.createRange().text;

      

            var input = "<Record><Type>TicketLoanResult</Type><TicketType>" + realpath + "</TicketType></Record>";

         var objXmlHttp = new ActiveXObject("Microsoft.XMLHTTP");      

         objXmlHttp.Open("POST", "XMLHttpPost.aspx", false);

         

         objXmlHttp.Send(input);

         

         var returnXml = objXmlHttp.responseText;

         if(returnXml!=null)

         {

        

            returnXml=parseInt(returnXml/1024/1024);

          

           

         }

        alert(returnXml);

       return false;

}

    </script>

 

后台代码：

public partial class XMLHttpPost : System.Web.UI.Page

{

    protected void Page_Load(object sender, EventArgs e)

    {

        try

        {

            XmlDocument xmlDocumenet = new XmlDocument();

            xmlDocumenet.Load(Request.InputStream);

            string type = xmlDocumenet.SelectSingleNode("descendant::Type").InnerText;

            string returnMessage = string.Empty;

            switch (type.Trim())

            {

                case "TicketLoanResult":

                    returnMessage = GetTicketLoanResult(xmlDocumenet);

                    break;

                default:

                    break;

            }

            Response.ContentType = "text/xml";

            Response.Write(returnMessage);

        }

        catch (Exception exceptional)

        {

            //如果有錯誤則返回錯誤信息（Xml格式）

            string errorMessage = "<Error>" + exceptional.Message + "</Error>";

            Response.ContentType = "text/xml";

            Response.Write(errorMessage);

        }

        finally

        {

            Response.End();

        }

    }

    private string GetTicketLoanResult(XmlDocument input)

    {

        XmlNode item = input.SelectSingleNode("descendant::TicketType");

        string ticketType = item.InnerText.Trim();

        FileStream stream = new FileStream(ticketType,FileMode.Open);

        return stream.Length.ToString();

    }

}

 

整体代码下载如下：

 

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